Re: hdd + ssd

Eric Sandeen
2015-10-22T18:27:12Z

On 10/22/15 1:23 PM, krautus@kr916.org wrote:
> Hello I'm trying to understand why and how to add one or more SSD (as a cache drive / keeping xfs log)
> to a traditional spinning xfs storage volume.
> I mean: which data will go to the ssd ? Inodes and dentries will go to the ssd ?
> Will the _read_ performance increase ?

You might want to look into something like dm-cache
https://en.wikipedia.org/wiki/Dm-cache

(TBH, I've not used it before, so grains of salt apply for your usecase).

Putting the log on an ssd is not likely to be the solution you want;
it certainly won't speed up reads.

-Eric

> In general I'm looking to increase (cache) the reading performance of folders with a lot of small files (emails),
> for email servers.
>
> Feel free to let me rtfm :)
> I'd gladly study the documentation / articles / benchmarks but my google-fu isn't in best shape.
>
> Thank you,
> Mike
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